High compression ratio does improve fuel economy. The advantage of lower compression ratio is that power density improves, that is to say you can get more power out of the same displacement engine. If you look at diesel racing engines they'll have low compression ratio, as will some other applications were fuel economy is less important than power output. Higher compression ratio increases peak cylinder pressures, thus the reduced power density.
__________________
Diesel Dave
My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".
1 Year Avg (Every Mile Traveled) = 47.8 mpg
BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html
|